Low activity and seasonal change in population size structure of grenadiers in oligotrophic abyssal North Pacific Ocean

Imants George Priede, A. R. Deary, David Mark Bailey, K. L. Smith

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25 Citations (Scopus)

Abstract

Analysis of video recordings of swimming, in abyssal grenadiers Coryphaenoides. spp. revealed site differences in tail-beat frequencies. At the highly oligotiophic deep central North Pacific (CNP: 5800 m depth) station fishes had significantly lower tail-beat frequencies (0.73 +/- 0.02 Hz. mean +/- S.E.) than fishes of similar size at the shallower 'Station F' (Sta. F: 4400m depth) beneath the more productive waters of the California Current Upwelling (1.06 +/- 0.04 Hz). These behavioural differences may be evidence for the proposed physiological adaptations of Coryphaenoides armatus and Coryphaenoides yaquinae, to different depths and food supply levels. At CNP. smaller fishes (38.9cm mean L-T) were present in autumn than in summer, (59.4cm L-T) suggesting large-scale migrations across the abyssal ocean floor despite the observed slow swimming speeds. (C) 2003 The Fisheries Society of the British Isles.

Original languageEnglish
Pages (from-to)187-196
Number of pages9
JournalJournal of Fish Biology
Volume63
DOIs
Publication statusPublished - 2003

Keywords

  • behaviour
  • Coryphaenoides
  • deep water
  • physiology
  • swimming
  • DEEP-SEA
  • CORYPHAENOIDES-ARMATUS
  • CHEMICAL-COMPOSITION
  • OXYGEN-CONSUMPTION
  • FOOD AVAILABILITY
  • SCAVENGING FISHES
  • HAWAIIAN-ISLANDS
  • SELECTIVE FACTOR
  • MIDWATER FISHES
  • ATLANTIC-OCEAN

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